def test_ImageStimulus(): # Create a dummy image: fname = 'test.png' shape = (25, 37) ndarray = np.random.rand(*shape) imsave(fname, (255 * ndarray).astype(np.uint8)) # Make sure ImageStimulus loaded is identical to dummy image: stim = ImageStimulus(fname) npt.assert_equal(stim.shape, (np.prod(shape), 1)) npt.assert_almost_equal(stim.data, ndarray.reshape((-1, 1)), decimal=2) npt.assert_equal(stim.metadata['source'], fname) npt.assert_equal(stim.metadata['source_shape'], shape) npt.assert_equal(stim.time, None) npt.assert_equal(stim.electrodes, np.arange(np.prod(shape))) os.remove(fname) # Resize the dummy image: ndarray = np.ones(shape) imsave(fname, (255 * ndarray).astype(np.uint8)) resize = (12, 18) stim = ImageStimulus(fname, resize=resize) npt.assert_equal(stim.shape, (np.prod(resize), 1)) npt.assert_almost_equal(stim.data, np.ones((np.prod(resize), 1)), decimal=2) npt.assert_equal(stim.metadata['source'], fname) npt.assert_equal(stim.metadata['source_shape'], shape) os.remove(fname)
def test_ProsthesisSystem_reshape_stim(rot, gtype, n_frames): implant = ProsthesisSystem(ElectrodeGrid((10, 10), 30, rot=rot, type=gtype)) # Smoke test the automatic reshaping: n_px = 21 implant.stim = ImageStimulus(np.ones((n_px, n_px, n_frames)).squeeze()) npt.assert_equal(implant.stim.data.shape, (implant.n_electrodes, 1)) npt.assert_equal(implant.stim.time, None) implant.stim = VideoStimulus(np.ones((n_px, n_px, 3 * n_frames)), time=2 * np.arange(3 * n_frames)) npt.assert_equal(implant.stim.data.shape, (implant.n_electrodes, 3 * n_frames)) npt.assert_equal(implant.stim.time, 2 * np.arange(3 * n_frames)) # Verify that a horizontal stimulus will always appear horizontally, even if # the device is rotated: data = np.zeros((50, 50)) data[20:-20, 10:-10] = 1 implant.stim = ImageStimulus(data) model = ScoreboardModel(xrange=(-1, 1), yrange=(-1, 1), rho=30, xystep=0.02) model.build() percept = label(model.predict_percept(implant).data.squeeze().T > 0.2) npt.assert_almost_equal(regionprops(percept)[0].orientation, 0, decimal=1)
def test_ImageStimulus_save(): # Create a horizontal bar: fname = 'test.png' shape = (5, 5) ndarray = np.zeros(shape, dtype=np.uint8) ndarray[2, :] = 255 imsave(fname, ndarray) stim = ImageStimulus(fname) fname2 = 'test2.png' stim.save(fname2) npt.assert_almost_equal(stim.data, ImageStimulus(fname2).data) os.remove(fname) os.remove(fname2)
def test_ImageStimulus_rotate(): # Create a horizontal bar: fname = 'test.png' shape = (5, 5) ndarray = np.zeros(shape, dtype=np.uint8) ndarray[2, :] = 255 imsave(fname, ndarray) stim = ImageStimulus(fname) # Vertical line: vert = stim.rotate(90, mode='reflect') npt.assert_almost_equal(vert.data.reshape(stim.img_shape)[:, 0], 0) npt.assert_almost_equal(vert.data.reshape(stim.img_shape)[:, 1], 0) npt.assert_almost_equal(vert.data.reshape(stim.img_shape)[:, 2], 1) npt.assert_almost_equal(vert.data.reshape(stim.img_shape)[:, 3], 0) npt.assert_almost_equal(vert.data.reshape(stim.img_shape)[:, 4], 0) # Diagonal, bottom-left to top-right: diag = stim.rotate(45, mode='reflect') npt.assert_almost_equal(diag.data.reshape(stim.img_shape)[0, 4], 1) npt.assert_almost_equal(diag.data.reshape(stim.img_shape)[2, 2], 1) npt.assert_almost_equal(diag.data.reshape(stim.img_shape)[4, 0], 1) npt.assert_almost_equal(diag.data.reshape(stim.img_shape)[0, 0], 0) npt.assert_almost_equal(diag.data.reshape(stim.img_shape)[4, 4], 0) # Diagonal, top-left to bottom-right: diag = stim.rotate(-45, mode='reflect') npt.assert_almost_equal(diag.data.reshape(stim.img_shape)[0, 0], 1) npt.assert_almost_equal(diag.data.reshape(stim.img_shape)[2, 2], 1) npt.assert_almost_equal(diag.data.reshape(stim.img_shape)[4, 4], 1) npt.assert_almost_equal(diag.data.reshape(stim.img_shape)[0, 4], 0) npt.assert_almost_equal(diag.data.reshape(stim.img_shape)[4, 0], 0) os.remove(fname)
def test_ImageStimulus_plot(): # Create a horizontal bar: fname = 'test.png' shape = (5, 5) ndarray = np.zeros(shape, dtype=np.uint8) ndarray[2, :] = 255 imsave(fname, ndarray) stim = ImageStimulus(fname) ax = stim.plot() npt.assert_equal(ax.axis(), (-0.5, 4.5, 4.5, -0.5)) os.remove(fname)
def test_ImageStimulus_threshold(): # Create a dummy image: fname = 'test.png' shape = (25, 37, 3) gray = 129 / 255.0 create_dummy_img(fname, shape, 'ones', gray=gray) # Gray levels are between 0 and 1, and can be inverted: stim = ImageStimulus(fname, as_gray=True) stim_th = stim.threshold(0.5) npt.assert_almost_equal(stim.data, gray) npt.assert_equal(stim.img_shape, shape[:2]) os.remove(fname)
def test_ImageStimulus_center(): # Create a horizontal bar: fname = 'test.png' shape = (5, 5) ndarray = np.zeros(shape, dtype=np.uint8) ndarray[2, :] = 255 imsave(fname, ndarray) # Center phosphene: stim = ImageStimulus(fname) npt.assert_almost_equal(stim.data, stim.center().data) npt.assert_almost_equal(stim.data, stim.shift(0, 2).center().data) os.remove(fname)
def test_ImageStimulus_invert(): # Create a dummy image: fname = 'test.png' shape = (25, 37) gray = 1 / 255.0 create_dummy_img(fname, shape, 'ones', gray=gray) # Gray levels are between 0 and 1, and can be inverted: stim = ImageStimulus(fname) npt.assert_almost_equal(stim.data, gray) npt.assert_almost_equal(stim.invert().data, 1 - gray) # Inverting does not change the original object: npt.assert_almost_equal(stim.data, gray) os.remove(fname)
def test_ImageStimulus_resize(): fname = 'test.png' shape = (25, 37, 3) gray = 129 / 255.0 create_dummy_img(fname, shape, 'ones', gray=gray) # Gray levels are between 0 and 1, and can be inverted: stim = ImageStimulus(fname) npt.assert_almost_equal(stim.data, gray) npt.assert_equal(stim.resize((13, -1)).img_shape, (13, 19, 3)) # Resize with one dimension -1: npt.assert_equal(stim.resize((-1, 24)).img_shape, (16, 24, 3)) with pytest.raises(ValueError): stim.resize((-1, -1)) os.remove(fname)
def test_ImageStimulus_rgb2gray(): # Create a dummy image: fname = 'test.png' shape = (25, 37, 3) gray = 1 / 255.0 create_dummy_img(fname, shape, 'ones', gray=gray) # Gray levels are between 0 and 1, and can be inverted: stim_rgb = ImageStimulus(fname) stim_gray = stim_rgb.rgb2gray() npt.assert_almost_equal(stim_gray.data, gray) npt.assert_equal(stim_gray.img_shape, shape[:2]) # Original stim unchanged: npt.assert_equal(stim_rgb.img_shape, shape) os.remove(fname)
def test_ImageStimulus(): # Create a dummy image: fname = 'test.png' shape = (25, 37, 4) ndarray = create_dummy_img(fname, shape, 'rand', return_data=True) # Make sure ImageStimulus loaded is identical to dummy image: stim = ImageStimulus(fname) npt.assert_equal(stim.shape, (np.prod(shape), 1)) npt.assert_almost_equal(stim.data, ndarray.reshape((-1, 1)), decimal=2) npt.assert_equal(stim.metadata['source'], fname) npt.assert_equal(stim.metadata['source_shape'], shape) npt.assert_equal(stim.time, None) npt.assert_equal(stim.electrodes, np.arange(np.prod(shape))) os.remove(fname)
def test_ImageStimulus_trim(): shape = (13, 29) ndarray = np.zeros(shape) ndarray[1:-1, 1:-1] = 0.1 ndarray[2:-2, 2:-2] = 0.2 stim = ImageStimulus(ndarray) npt.assert_equal(stim.trim().img_shape, (shape[0] - 2, shape[1] - 2)) npt.assert_equal( stim.trim(tol=0.05).img_shape, (shape[0] - 2, shape[1] - 2)) npt.assert_equal( stim.trim(tol=0.1).img_shape, (shape[0] - 4, shape[1] - 4)) npt.assert_equal(stim.trim(tol=0.2).img_shape, (1, 0)) npt.assert_equal( stim.trim(tol=0.1).img_shape, stim.trim().trim(tol=0.1).img_shape)
def test_ImageStimulus_scale(): # Create a horizontal bar: fname = 'test.png' shape = (5, 5) ndarray = np.zeros(shape, dtype=np.uint8) ndarray[2, :] = 255 imsave(fname, ndarray) # Scale phosphene: stim = ImageStimulus(fname) npt.assert_almost_equal(stim.data, stim.scale(1).data) npt.assert_almost_equal(stim.scale(0.1)[12], 1) npt.assert_almost_equal(stim.scale(0.1)[:12], 0) npt.assert_almost_equal(stim.scale(0.1)[13:], 0) with pytest.raises(ValueError): stim.scale(0) os.remove(fname)
def test_ImageStimulus_encode(): stim = ImageStimulus(np.random.rand(4, 5)) # Amplitude encoding in default range: enc = stim.encode() npt.assert_almost_equal(enc.time[-1], 500) npt.assert_almost_equal(enc.data.max(axis=1).min(), 0) npt.assert_almost_equal(enc.data.max(axis=1).max(), 50) # Amplitude encoding in custom range: enc = stim.encode(amp_range=(2, 43)) npt.assert_almost_equal(enc.time[-1], 500) npt.assert_almost_equal(enc.data.max(axis=1).min(), 2) npt.assert_almost_equal(enc.data.max(axis=1).max(), 43) with pytest.raises(TypeError): stim.encode(pulse={'invalid': 1}) with pytest.raises(ValueError): stim.encode(pulse=LogoUCSB())
def test_ImageStimulus_filter(): # Create a dummy image: fname = 'test.png' shape = (25, 37) create_dummy_img(fname, shape, 'rand') stim = ImageStimulus(fname) for filt in ['sobel', 'scharr', 'canny', 'median']: filt_stim = stim.filter(filt) npt.assert_equal(filt_stim.shape, stim.shape) npt.assert_equal(filt_stim.img_shape, stim.img_shape) npt.assert_equal(filt_stim.electrodes, stim.electrodes) npt.assert_equal(filt_stim.time, None) # Invalid filter name: with pytest.raises(TypeError): stim.filter({'invalid'}) with pytest.raises(ValueError): stim.filter('invalid') os.remove(fname)
def test_ImageStimulus_shift(): # Create a horizontal bar: fname = 'test.png' shape = (5, 5) ndarray = np.zeros(shape, dtype=np.uint8) ndarray[2, :] = 255 imsave(fname, ndarray) stim = ImageStimulus(fname) # Top row: top = stim.shift(0, -2) npt.assert_almost_equal(top.data.reshape(stim.img_shape)[0, :], 1) npt.assert_almost_equal(top.data.reshape(stim.img_shape)[1:, :], 0) # Bottom row: bottom = stim.shift(0, 2) npt.assert_almost_equal(bottom.data.reshape(stim.img_shape)[:4, :], 0) npt.assert_almost_equal(bottom.data.reshape(stim.img_shape)[4, :], 1) # Bottom right pixel: bottom = stim.shift(4, 2) npt.assert_almost_equal(bottom.data.reshape(stim.img_shape)[4, 4], 1) npt.assert_almost_equal(bottom.data.reshape(stim.img_shape)[:4, :], 0) npt.assert_almost_equal(bottom.data.reshape(stim.img_shape)[:, :4], 0) os.remove(fname)
def test_ImageStimulus_crop(): fname = 'test.png' shape = (30, 50, 3) gray = create_dummy_img(fname, shape, 'rand') stim = ImageStimulus(fname) stim_cropped = stim.crop(idx_rect=[5, 10, 25, 40]) npt.assert_equal(stim_cropped.img_shape, (20, 30, 3)) npt.assert_equal( stim_cropped.data.reshape(stim_cropped.img_shape)[3, 7], stim.data.reshape(stim.img_shape)[8, 17]) npt.assert_equal( stim_cropped.data.reshape(stim_cropped.img_shape)[10, 28], stim.data.reshape(stim.img_shape)[15, 38]) npt.assert_equal( stim.electrodes.reshape(30, 50, 3)[8, 17, 0], stim_cropped.electrodes.reshape(20, 30, 3)[3, 7, 0]) npt.assert_equal( stim.electrodes.reshape(30, 50, 3)[15, 38, 2], stim_cropped.electrodes.reshape(20, 30, 3)[10, 28, 2]) stim_cropped2 = stim.crop(left=10, right=8, top=6, bottom=7) npt.assert_equal(stim_cropped2.img_shape, (17, 32, 3)) npt.assert_equal( stim_cropped2.data.reshape(stim_cropped2.img_shape)[3, 7], stim.data.reshape(stim.img_shape)[9, 17]) npt.assert_equal( stim_cropped2.data.reshape(stim_cropped2.img_shape)[10, 28], stim.data.reshape(stim.img_shape)[16, 38]) #"crop-indices and crop-width (left, right, up, down) cannot exist at the same time" with pytest.raises(ValueError): stim.crop(idx_rect=[5, 10, 25, 40], left=10) with pytest.raises(ValueError): stim.crop([5, 10, 25, 40], right=8) with pytest.raises(ValueError): stim.crop([5, 10, 25, 40], top=6) with pytest.raises(ValueError): stim.crop([5, 10, 25, 40], bottom=7) # "crop-width(left, right, up, down) cannot be negative" with pytest.raises(ValueError): stim.crop(left=-1) with pytest.raises(ValueError): stim.crop(right=-1) with pytest.raises(ValueError): stim.crop(top=-1) with pytest.raises(ValueError): stim.crop(bottom=-1) # "crop-width should be smaller than the shape of the image" with pytest.raises(ValueError): stim.crop(left=32, right=20) with pytest.raises(ValueError): stim.crop(top=12, bottom=18) # "crop-indices must be on the image" with pytest.raises(ValueError): stim.crop([-1, 10, 25, 40]) with pytest.raises(ValueError): stim.crop([5, -1, 25, 40]) with pytest.raises(ValueError): stim.crop([5, 10, 31, 40]) with pytest.raises(ValueError): stim.crop([5, 10, 25, 51]) # "crop-indices is invalid. It should be [y1,x1,y2,x2], where (y1,x1) is upperleft and (y2,x2) is bottom-right" with pytest.raises(ValueError): stim.crop([5, 10, 4, 40]) with pytest.raises(ValueError): stim.crop([5, 10, 25, 9])